Hydraulic oscillation damper



April 3o, 1940.

P. DRAMINSIKY HYDRAULIC OSCILLATION DAMPER` Filed Jam.` 21, 193e www Patented pr. 30, v1940 l i l v i UNITED STATES PATENT OFFICE Per Draminsky, Copenhagen, Denmark Application January 21, 193s, serial No. lsazco' In Denmark January 27, 1937 s claims. (cl. 74-574) For the absorption or damping of torsional os- -partments will be lower than atmospheric prescillations in crank shafts it has been proposed to sure, but as this pressure cannot be lower than use oscillation absorbers or dampers consisting of complete vacuum, i. e. 1 kg./cm.2 below atmosan inertia mass rotatably mounted on the crank pheric pressure, a maximum differential pressure 5 shaft, e. g. on one end thereof, and hydraulically of 2 Isig/cm.2 will be available for the supply of 5 coupled to the shaft whereby wings or cams rigoil. To secure a reliable oil supply in this manidly connected with the same are adapted to ner the oil supply pressure had to be considermove in fluid-tight compartments in the inertia. ably higher than the lubricating' oil pressure. mass. The two parts of each compartment, situwhich would require a particular oil pump and .0 ated at oppositesides of the wing, communicate thus complicate the construction considerably. 10 with each other through passages, preferably' Consequently a vacuum can be produced in provided in the wings and yielding a great rethe compartments in the known constructions, sistancey to .the passage of uid, and through or air can be sucked in through the leaks, and these 'passages the uid contained in the said -as the preSuDDOSitiOn 0f the gOOd aCtiOn 0f the r,

y5 compartments will be pressed from one part or absorberV is that the compartments are liquidchamber ton another, when the shaft and the filled, the e'ciency of the absorber canbe coninertia mass move relatively to each other Be- Sidelably' reduced by the Said facts. tween the inertia mass and the shaft springs are The invention has for its object to do away inserted. When the said springs are made with with this deficiency in a hydraulic oscillation ab- 20 suitable dimensions, the absorbing action can be sorberor damper of the said kind, and it is main- 2U increased, because hereby the relative motion ly characterised thereby that the Oscillation ab- |between the inertia mass and the shaft can be sorber is so constructed that the liquid-filled comaugmented. partments communicate only periodically with Oscillation absorbers of the said kind may act a liquid Supply device, and during the rest 0f l5 very wen in the case of small engines and ,3, time are kept closed, thus preventing the oil from 25 relatively small value of the occurring forces, llllussing bask fI'Om the Commitments and ensurbut it has appeared, that large absorbers of this ing their being kept lilled-With liquid and Dretype intended| to damp vigorous oscillations do -Venting the arising 0f too high pressures in the not yield very far whatthey should yiel-d. theocmpartments.

i0 retically. The reason is, that the said compart- The invention may e. g. be carried out by em? 3U ments do not remain liquid filled. Losses take DlOying aslide' 0r Similar device serving to keep place continuously through leaks, and therefore the commun-ieating passages 0r holes fOr the Suppassages or apertures leading to the compariply of liquid Ito the compartments closedduring ments must be arranged, through which liquid the main portion of a revolution, so that only i5 can be supplied to compensate for the loss through during part or parts of a revolution to the corn- 3 the leaks, but when the absorber is exposed to partments is allowed. vigorous oscillationsnthe liquid pressure may very The oscillation absorber may e. g. be placed on well become so high that more liquid'is pressed the shaft, the oscillations of which have to be out 'through the Said apertures Ol'passuges than. absorbed, around a'stationary slide. 'Ihe latter i0 can manage t0 be sucked in again. The fact is, may be connected with and get a supply of oil 40 that the maximum liquid pressure inthe comfrom oil passages in the shaft communicating pertinents, if Considerable impulses have to be f. inst. with a pressure lubricatingsystem. absorbed, will often be about 10 Rs2/Cm?,A and The invention is illustrated in the accompany the liquid employed to compensate for losses` ing drawing, in which r r. ,through leaks is normally'oil taken from the usual Fig. 1 is a cross section tnrougha constructionluin'Gtlftin-i`V oil system of `the engine, s0 that a al form of a' hydraulic oscillation absorber ac A maximum superpressure of 1 kg./cm.2 willbe col-ding to the invention, available. means that during one half 0f Fig. 2 is a 1ongitudina1 section throgh the the oscillatory period, in which superpressure is same, 50 present in one set of compartments oil is pressed Fig. 3 shows a modified constructional form of :back through the supply apertures with the actual part of Fig. 2, and differential pressure, which may amount to 9 y Fig, 4 is an evolution of part of the slide shown kgjcm. During the following half of the osin Fig. 3. 5 cillatory period the pressure in the same com Referring now to Figs. 1 and 2, lis a part rig- 55 idly connected with the shaft A and carrying a number of radial wings or cams la, in total four in the illustrated constructional form. Around fthe part `I and rotatable in relation thereto a part 2 is mounted, which will be called inertia mass in the following and in .which are formed close vigorous springs 4 tending to keep the part lI with the wings Ia in such a position that the latter are in their. central position relatively to the compartments; In the wings I a, the faces of which beaii. against the material of the inertia mass, holes 5 are bored having a diameter which is exactly calculated in regard to the desired absorbing effect. The part I has, besides, a number of holes 6, which may be radial as indicated, and which lead at their outer end into the compartments'3, one hole on each side of a wing Ia., while their inner ends face a stationary slide 1, so that they are normally closed. The slide 'I has, however, a recess 8 communicating through a bore 9 with an oil supply pipe I4 and, contingently, also through a bore I Il with a pipe I5 leading to a control cock II outsidetlhe engine. The slide 1 may be kept stationary in any suitable manner.

'I'he oscillation absorber proper acts according to the principle known per se, but the employment of the slide l has for its result that the compartments 3 are kept closed during the main portion of the revolution of the shaft A and herewith also of the parts I and 2. Only during the part of a revolution where a hole or pair of holes 6 faces the recess 8 access is open to the corresponding compartment 3 for oil supply from the pipe I4 and bore 9. l through the holes 6 and recesses 8 reduces the pressure diiference between the parts of the compartments on both sides of the wings Ia, so that the supply of oil can take place easier. Excess of oil can escape through the bore I0 and pipe I5 to the control cock II.

In the constructional form according' to Figs. 3 and 4 the oil is supplied through the crank shaft proper, Awhich is supposed to have lubricating oil' bores communicating with a lubricating pressure system. A bore of this kind'in the shaft is indicated by B, and this bore communicates through a transverse bore b and bores I2 in the hub of ltionary-slide 1.- The recess I5 communicates with the recess 8 as shown in Fig. 4, and in this manner oil can be supplied under pressure to the hole or holes Ii facing the recess 8, while the holes 6 and corresponding compartments 3 are closed as described with reference to Figs. 1 and 2. Also in this constructional form a pipe I5 may lead from the recess 8 through a bore ID to a control cock II.

The invention is not limited to the illustrated and described constructional forms, which are only given by way of example to illustrate the principle of the invention.

I claim:

1. A hydraulic oscillation absorber or damper for rotating engine parts comprising an inertia mass, compartments in said mass designed to hold a. fluid, projecting members xed to the rotating engine part and extending into said compartments and means for supplying iiuid to said com- The communication partments, said means being controlled positively in dependency of the revolution of said rotating engine part so as to supply the iiuid periodically during said revolution.

2. A hydraulic oscillation absorber or damper for rotating engine parts, comprising an inertia mass, compartments in said mass designed to hold a fluid, projecting members iixed to the rotating engine part and extending into said compartments, means normally holding saidprojecting members substantially at the centers of said compartments, a source of uid supply and means for supplying uid to said compartments said means being controlled positively in dependency of the revolution of said rotating engine part so as to establish communication between the compartments and the source of fluid during a i'lxed portion of the revolution.

3. A hydraulic oscillation absorber or damper for rotating engine parts comprising an inertia mass, compartments in said mass designed to hold a uid, projecting members xed to the rotating engine part and extending int'o said compartments, conduits for leading a iiuid to said compartments and a single valve member controlling all said conduits so as to feed uid to said compartments periodically during the revolution of said rotating engine part.

4. A hydraulic oscillation absorber or damper for rotating engine parts comprising an inertia mass, compartments in said mass designed to hold a uid, projecting members xed to the rotating engine part and extending into said compartments, a series of conduits extending through the rotating engine part for conducting Iiuid to said compartments and a stationary slide having a i'luid supply conduit adapted to successively connect with said conduits to supply iiud intermittently to said compartments.

5. A hydraulic oscillation absorber or damper for rotating engine parts comprising an inertia mass, compartments in said mass designed to hold a fluid, projecting members xed to the rotating engine part and extending into said compartments, a series of conduits extending through the rotating engine part for conducting uid to said compartments and a stationary slide coaxially mounted with relation to said engine part and having a supply conduit adapted to successively connect with the conduits of said series.

6. A hydraulic oscillation absorber for rotating engine parts comprising an inertia mass having compartments therein designed to hold a fluid, vanes xed' to a rotating engine part extending into the said compartments,.means permitting escape of the uid from one side to the other l of the rotating engine part, fluid supply conduits in said vanes leading to said compartments and a stationary slideI havingy a conduit adapted to connect with said iluid supply conduits succes-u sively. 1

7. A hydraulic oscillation absorber for rotating engine parts comprising an inertia mass having compartments therein designed to hold a uid, vanes fixed to a rotating engine part extending into the said compartments, means permitting 1 escape of the f iuid from one side to the other of the rotating engine part, :duid supply conduits in said vanes leading to said compartments, a stationary slide associated with said vanes controlling said fluid supply conduits and a uid 1 conduit in said slide connected with the pressure lubricating system of the engine which is brought successively into connection with the conduits in the rotating engine part.

8. A hydraulic oscillation absorber for rotating 1 a uid supply which is designed to be brought successively into connection with the conduits in the rotating engine part, a discharge conduit Ialso in said slide communicating with said conduit connected to a iuid supply and a valve controlling said discharge conduit.

PER DRAMINSKY. 

